As promised, here is the recipe from my mom's grandmother:
*2 cups sugar
*2 cups flour
*2 tsp almond extract
*1 tsp vanilla extract
*1/2 lb butter (softened or melted)
Mix all ingredients together thoroughly. Pour batter into a loaf pan, and bake at 350F for 1 1/4 - 1 1/2 hours. (This really varies by oven. I usually check it at 45 minutes and cover it with foil if the top is browning too fast. It'll probably take a few tries to get it so the edges don't come out dry; you can also use mini-loaf pans to make it easier to cook evenly.) Koek is done when a knife inserted in the middle comes out clean.
Enjoy the tasty Dutch treat!